<template>
	<h1 ref="app">app</h1>
	<p>{{ num }}</p>
	<button @click="update1">update1</button>
</template>

<script setup>
import { ref } from "vue";
// import Child from './Chid.vue'

const num = ref(0);

const update1 = () => {
	num.value++;
};
</script>
